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Monitoring and Testing
4-24
3166-A2-GB20-10
November 1998
Starting a Data Terminal Loopback
The Data Terminal Loopback command (DTLB) loops the data received from
Port 1, for all DS0 channels allocated to the port, back out of the port. This
loopback occurs after the data passes through the port circuitry but before it
reaches the T1 framer.
98-15950
CSUDSU
NETWORK
INTERFACE
ALL 1s
DTLB
PORT 1
" Procedure
To perform a Data Terminal loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3. From the Loopback screen, press the key until the DTLB selection
appears on the screen.
4. Select DTLB.
F1
Loopback:
RLB DCLB DTLB
F2
F3
Test Started appears on Line 2. If a Data Terminal loopback is already in
progress, the Already Active message appears. If an invalid combination of
loopbacks is in progress, the error message Invld Test Combo appears (see
Table 4-7 for valid loopback test combinations).